In Column::setChanged(), invalidate the column properties first and then emit the data changed signal

Description

In Column::setChanged(), invalidate the column properties first and then emit the data changed signal. When done the other way around, the dependent plots are accessing invalid properties and resizing their internal containers potentially wrongly.

Conformity

• Changelog entry
• Unit tests
• Update INSTALL
• Downport
• Fixes: #955 (closed)

When external dependencies are removed

• Reporting to ...